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| Criterion |  UX Research Diary Study |  Operations Kaizen Event |  Product Discovery Smoke Test |  Operations PDCA Cycle |
|---|---|---|---|---|
Purposedifferent | When experiences build up over days or weeks and a single session cannot capture them, Diary Study records the course of everyday life. Recurring triggers, moods, and habits become visible this way, beyond the sharpness of memory. | For a tightly scoped process segment with noticeable waste, the method bundles shared energy for change. It suits situations that call for fast learning loops and visible adjustments. | When demand only needs to be roughly verified, it tests interest with minimal effort. It measures whether people would take a next step at all. | For an improvement that still has to prove itself in everyday work, the method runs it through small learning loops. It connects planning, checking, and standardization into a repeatable learning mode. |
Complexitydifferent | Medium | Medium | Low | Low |
Timedifferent | 1-4 Wochen | 0.5-5 Tage | 1-5 Tage | 1 h bis mehrere Wochen |
Participantsdifferent | 5-20 | 4-10 | Nutzertraffic | 1-8 |
Formatdifferent | Async | Workshop | Async | Workshop + async |
Outputdifferent | Diary Entries, Longitudinal Patterns, Experience Timeline | Kaizen Charter, Waste List, Improvement Experiments, Standard Work Update | Interest Metrics, Conversion Signal, Learning Note | PDCA Log, Experiment Plan, Learning Outcome, Standard Change |
Tagsno overlap | UX researchTrackingBehavior | LeanContinuous improvementOperations | ValidationExperimentsDemandGrowth | Continuous improvementLeanExperiments |